Geigerite
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About Geigerite
Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
Hardness:
3
Crystal System:
Triclinic
Member of:
Name:
Named after Dr. Thomas Geiger (1920 - 1990), Swiss mineralogist and metallurgist in the machinery industry and specialist for the manganese ores and minerals of Falotta and Alp Parsettens to which he devoted his PhD thesis and a series of later studies.
Classification of Geigerite
Approved
Approval Year:
1985
7/C.06-60
8.CE.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.2
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.8.10
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
Physical Properties of Geigerite
Hardness:
3 on Mohs scale
Optical Data of Geigerite
Type:
Biaxial (-)
RI values:
nα = 1.601 nβ = 1.630 nγ = 1.660
2V:
Measured: 89° , Calculated: 88°
Max Birefringence:
δ = 0.059

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Chemical Properties of Geigerite
Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
IMA Formula:
Mn2+5(AsO4)2(AsO3OH)2 · 10H2O
Elements listed:
Crystallography of Geigerite
Crystal System:
Triclinic
Cell Parameters:
a = 7.94 Å, b = 10.69 Å, c = 6.77 Å
α = 80.97°, β = 84.2°, γ = 81.85°
α = 80.97°, β = 84.2°, γ = 81.85°
Ratio:
a:b:c = 0.743 : 1 : 0.633
Unit Cell V:
560.3 ų
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.45 | (100) |
7.85 | (13) |
3.507 | (21) |
3.340 | (20) |
3.051 | (24) |
3.011 | (17) |
2.786 | (14) |
Type Occurrence of Geigerite
Synonyms of Geigerite
Other Language Names for Geigerite
Relationship of Geigerite to other Species
Member of:
Other Members of this group:
Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O | Tric. 1 : P1 |
Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O | Tric. 1 : P1 |
Related Minerals - Nickel-Strunz Grouping
8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.05 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
8.CE.10 | Newberyite | Mg(HPO4) · 3H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.CE.15 | Brassite | Mg(HAsO4) · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.CE.20 | Phosphorrösslerite | Mg(HPO4) · 7H2O | Mon. 2/m : P2/b |
8.CE.20 | Rößlerite | Mg(HAsO4) · 7H2O | Mon. 2/m : B2/b |
8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O | Mon. 2/m : P2/b |
8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O | Mon. |
8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O | Tric. 1 : P1 |
8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O | Tric. 1 : P1 |
8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O | Mon. 2/m : B2/b |
8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O | |
8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Manganohörnesite | (Mn,Mg)3(AsO4)2 · 8H2O | Mon. 2/m : P2/m |
8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Vivianite | Fe2+3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O | Tric. 1 : P1 |
8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O | Tric. 1 : P1 |
8.CE.55 | Koninckite | Fe3+PO4 · 3H2O | Tet. |
8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O | Mon. |
8.CE.65 | Steigerite | Al(VO4) · 3H2O | Mon. 2/m : P21/m |
8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O | Mon. 2/m : P2/m |
8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O | Mon. |
8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O | Mon. |
8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O | Tric. 1 : P1 |
8.CE.75 | Unnamed (Ca-analogue of Zigrasite) | CaZr[PO4]2 · 4H2O | Tric. |
8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O | Amor. |
8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) | Tric. 1 : P1 |
Related Minerals - Dana Grouping (8th Ed.)
39.2.6.1 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
39.2.6.1 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
39.2.6.4 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
39.2.6.5 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
39.2.6.6 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O | Tric. 1 : P1 |
Related Minerals - Hey's Chemical Index of Minerals Grouping
20.8.1 | Sarkinite | Mn2+2(AsO4)(OH) | Mon. 2/m : P2/m |
20.8.2 | Eveite | Mn2+2(AsO4)(OH) | Orth. mmm (2/m 2/m 2/m) : Pnnm |
20.8.3 | Arsenoclasite | Mn2+5(AsO4)2(OH)4 | Orth. |
20.8.4 | Flinkite | Mn2+2Mn3+(AsO4)(OH)4 | Orth. |
20.8.5 | Jarosewichite | Mn2+3Mn3+(AsO4)(OH)6 | Orth. 2 2 2 |
20.8.6 | Allactite | Mn2+7(AsO4)2(OH)8 | Mon. 2/m : P21/b |
20.8.7 | Krautite | Mn(HAsO4) · H2O | Mon. 2 : P21 |
20.8.8 | Synadelphite | Mn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
20.8.9 | Sterlinghillite | Mn2+3(AsO4)2 · 3H2O | Tric. 1 : P1 |
20.8.11 | Akrochordite | (Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O | Mon. 2/m : P21/b |
20.8.12 | Manganohörnesite | (Mn,Mg)3(AsO4)2 · 8H2O | Mon. 2/m : P2/m |
20.8.13 | Fluckite | CaMn2+(HAsO4)2 · 2H2O | Tric. 1 : P1 |
20.8.14 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
20.8.15 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O | Tric. |
20.8.16 | Wallkilldellite | Ca2Mn2+3(AsO4)2(OH)4 · 9H2O | Hex. |
20.8.17 | Berzeliite | (NaCa2)Mg2(AsO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
20.8.18 | Manganberzeliite | NaCa2Mn2+2(AsO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
20.8.19 | Magnesiochlorophoenicite | (Mg,Mn)3Zn2(AsO4)(OH,O)6 | Mon. 2/m : B2/m |
20.8.20 | Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
20.8.21 | Hematolite | (Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23 | Trig. 3 : R3 |
20.8.22 | Grischunite | NaCa2Mn2+5Fe3+(AsO4)6 · 2H2O | Orth. |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Geigerite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676-684.
Internet Links for Geigerite
mindat.org URL:
https://www.mindat.org/min-1669.html
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Localities for Geigerite
Locality List




All localities listed without proper references should be considered as questionable.
Italy | |
| Cabella, R., Basso, R., Lucchetti, G., Palenzona, A. (2000): Geigerite from Mt. Nero manganese mine (Northern Appennines, La Spezia, Italy). Neues Jahrbuch für Mineralogie, 12, 570-576. |
Japan | |
| Kato et al (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.; Matsubara, S., Kato, A., Shimizu, M., Sekiuchi, K., and Suzuki, M. (1996) Romeite from the Gozaisho mine, Iwaki, Japan. Mineralogical Journal 18, 155-160. |
| 島倉広至, 三浦貴生, 浜根大輔, 松枝大治, & 三浦裕行. (2015). 北海道手稲鉱山産 Te, Bi, As 鉱物. 北海道大学地球物理学研究報告, 78, 19-35. |
Romania | |
| Collected by Gábor Koller, XRD and EDS: Sándor Szakáll and Béla Fehér |
Saudi Arabia | |
| Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504. |
Switzerland (TL) | |
| Amer.Mineralogist 74, pages 676 - 684. |
| Raman & EDX through AMI identificaton service. Found in 2010 by Claudio Leporatti; pers. comm. Roberto Bracco (2015) |
Săcărâmb, Deva, Hunedoara, Romania